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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package com.sun.corba.se.impl.encoding;

import java.nio.ByteBuffer;
import com.sun.corba.se.spi.orb.ORB;
import com.sun.corba.se.spi.logging.CORBALogDomains;
import com.sun.corba.se.impl.protocol.giopmsgheaders.FragmentMessage;
import com.sun.corba.se.impl.protocol.giopmsgheaders.Message;
import com.sun.corba.se.impl.logging.ORBUtilSystemException;

public class BufferManagerReadGrow
    implements BufferManagerRead, MarkAndResetHandler {

  // REVISIT - This should go in an abstract class called
  //           BufferManagerReadBase which should implement
  //           BufferManagerRead. Then, this class should extend
  //           BufferManagerReadBase.
  private ORB orb;

  private ORBUtilSystemException wrapper;

  BufferManagerReadGrow(ORB orb) {
    this.orb = orb;
    this.wrapper = ORBUtilSystemException.get(orb,
        CORBALogDomains.RPC_ENCODING);
  }

  public void processFragment(ByteBuffer byteBuffer, FragmentMessage header) {
    // REVISIT - should we consider throwing an exception similar to what's
    //           done for underflow()???
  }

  public void init(Message msg) {
  }

  public ByteBufferWithInfo underflow(ByteBufferWithInfo bbwi) {
    throw wrapper.unexpectedEof();
  }

  public void cancelProcessing(int requestId) {
  }

  // Mark and reset handler -------------------------

  private Object streamMemento;
  private RestorableInputStream inputStream;
  private boolean markEngaged = false;

  public MarkAndResetHandler getMarkAndResetHandler() {
    return this;
  }

  public void mark(RestorableInputStream is) {
    markEngaged = true;
    inputStream = is;
    streamMemento = inputStream.createStreamMemento();
  }

  // This will never happen
  public void fragmentationOccured(ByteBufferWithInfo newFragment) {
  }

  public void reset() {

    if (!markEngaged) {
      return;
    }

    markEngaged = false;
    inputStream.restoreInternalState(streamMemento);
    streamMemento = null;
  }

  // Nothing to close and cleanup.
  public void close(ByteBufferWithInfo bbwi) {
  }
}
